v1.2.3

* Added support for reading and inspecting Bowtie 2 indexes.
  Bowtie 2 indexes can now be used with either Bowtie or Bowtie 2.
* Added support for building an index from a gzipped-compressed
  FASTA.
* Fixed issue preventing bowtie from reporting repeated alignments
  when -M is specified.
* Fixed issue with -F mode omitting final base of each read.
* Fixed clipping of first letter of first read in batches after first.
* Fixed an issue preventing bowtie wrapper script from finding indexes.